allopurinol and its Impurities

Allopurinol is a purine analog and it is a structural isomer of hypoxanthine. It is an inhibitor of the enzyme xanthine oxidase. Allopurinol is used to treat excess uric acid in the blood and gout. It is sold under the brand name Zyloprim. Reference standards of Allopurinol API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.

Displaying 52 results for allopurinol Impurities
Drug Reference Standards & Impurity Synthesis in India
PA 01 39000

Allopurinol

Allopurinol

  • Catalogue No.:PA 01 39000

  • CAS :

    315-30-0

  • Molecular Formula : C5H4N4O

  • Molecular Weight :  136.11

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Drug Reference Standards & Impurity Synthesis in India
PA 01 39010

Allopurinol - Impurity A

3-Amino-4-carbamoylpyrazole Hemisulfate

  • Catalogue No.:PA 01 39010

  • CAS :

    27511-79-1

  • Molecular Formula : C4H6N4O•0.5H2SO4

  • Molecular Weight : 175.16

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Drug Reference Standards & Impurity Synthesis in India
PA 01 39020

Allopurinol - Impurity B

3-(Formylamino)-1H-pyrazole-4-carboxamide

  • Catalogue No.:PA 01 39020

  • CAS :

    22407-20-1

  • Molecular Formula : C5H6N4O2

  • Molecular Weight : 154.13

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Drug Reference Standards & Impurity Synthesis in India
PA 01 39030

Allopurinol - Impurity C

3-(4H-1,2,4-Triazol-4-yl)-1H-pyrazole-4-carboxamide

  • Catalogue No.:PA 01 39030

  • CAS :

    1346604-13-4

  • Molecular Formula : C6H6N6O

  • Molecular Weight : 178.15

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Drug Reference Standards & Impurity Synthesis in India
PA 01 39040

Allopurinol - Impurity D

Ethyl 3-Amino-4-pyrazolecarboxylate

  • Catalogue No.:PA 01 39040

  • CAS :

    6994-25-8

  • Molecular Formula : C6H9N3O2

  • Molecular Weight : 155.15

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Drug Reference Standards & Impurity Synthesis in India
PA 01 39050

Allopurinol - Impurity E

3-(Formylamino)-1H-pyrazole-4-carboxylic Acid Ethyl Ester

  • Catalogue No.:PA 01 39050

  • CAS :

    31055-19-3

  • Molecular Formula : C7H9N3O3

  • Molecular Weight : 183.16

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Drug Reference Standards & Impurity Synthesis in India
PA 01 39060

Allopurinol - Impurity F (35% in Water)

Hydrazine

  • Catalogue No.:PA 01 39060

  • CAS :

    302-01-2

  • Molecular Formula : H4N2

  • Molecular Weight : 32.05

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Drug Reference Standards & Impurity Synthesis in India
PA 01 39061

Allopurinol - Impurity F (Hydrochloride Salt)

Hydrazine Monohydrochloride

  • Catalogue No.:PA 01 39061

  • CAS :

    2644-70-4

  • Molecular Formula : ClH5N2

  • Molecular Weight : 68.51

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Drug Reference Standards & Impurity Synthesis in India
PA 01 39510

3-Amino-4-cyanopyrazole

3-Amino-4-cyanopyrazole

  • Catalogue No.:PA 01 39510

  • CAS :

    16617-46-2

  • Molecular Formula : C4H4N4

  • Molecular Weight : 108.1

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Drug Reference Standards & Impurity Synthesis in India
PA 27 01358

Allopurinol - Impurity F (Monohydrate Salt)

Hydrazine Hydrate

  • Catalogue No.:PA 27 01358

  • CAS :

    7803-57-8

  • Molecular Formula : H6N2O

  • Molecular Weight : 50.06

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Drug Reference Standards & Impurity Synthesis in India
PA STI 004680

Allopurinol-d2

Allopurinol-d2

  • Catalogue No.:PA STI 004680

  • CAS :

    916979-34-5

  • Molecular Formula : C5H2D2N4O

  • Molecular Weight : 138.12

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Drug Reference Standards & Impurity Synthesis in India
PA STI 033020

4,6-Dihydroxypyrazolo[3,4-d]pyrimidine-13C,15N2

4,6-Dihydroxypyrazolo[3,4-d]pyrimidine-13C,15N2

  • Catalogue No.:PA STI 033020

  • CAS :

    1217036-71-9

  • Molecular Formula : C413CH4N215N2O2

  • Molecular Weight : 155.09

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Drug Reference Standards & Impurity Synthesis in India
PA USP1013013

Allopurinol Related Compound B (5-(formylamino)-1H-pyrazole-4-carboxamide) (1013013)

Allopurinol Related Compound B (5-(formylamino)-1H-pyrazole-4-carboxamide) (1013013)

  • Catalogue No.:PA USP1013013

  • CAS :

    22407-20-1

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA USP1013024

Allopurinol Related Compound A (3-Amino-4-carboxamidopyrazole Hemisulfate) (1013024)

Allopurinol Related Compound A (3-Amino-4-carboxamidopyrazole Hemisulfate) (1013024)

  • Catalogue No.:PA USP1013024

  • CAS :

    27511-79-1

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA USP1013068

Allopurinol Related Compound E (ethyl 5-(formylamino)-1H-pyrazole-4-carboxylate) (1013068)

Allopurinol Related Compound E (ethyl 5-(formylamino)-1H-pyrazole-4-carboxylate) (1013068)

  • Catalogue No.:PA USP1013068

  • CAS :

    31055-19-3

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA USP1013002

Allopurinol (1013002)

Allopurinol (1013002)

  • Catalogue No.:PA USP1013002

  • CAS :

    315-30-0

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA USP1013079

Allopurinol Related Compound F (ethyl-(E/Z)-3-(2-carbethoxy-2-cyanoethenyl)amino-1H-pyrazole-4-carb (1013079)

Allopurinol Related Compound F (ethyl-(E/Z)-3-(2-carbethoxy-2-cyanoethenyl)amino-1H-pyrazole-4-carb (1013079)

  • Catalogue No.:PA USP1013079

  • CAS :

    321571-07-7

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA USP1013046

Allopurinol Related Compound D (ethyl 5-amino-1H-pyrazole-4-carboxylate) (1013046)

Allopurinol Related Compound D (ethyl 5-amino-1H-pyrazole-4-carboxylate) (1013046)

  • Catalogue No.:PA USP1013046

  • CAS :

    6994-25-8

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA BP870RB

allopurinol (870RB)

allopurinol (870RB)

  • Catalogue No.:PA BP870RB

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA BP831RB

allopurinol impurity A (831RB)

allopurinol impurity A (831RB)

  • Catalogue No.:PA BP831RB

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA BP832RB

allopurinol impurity B (832RB)

allopurinol impurity B (832RB)

  • Catalogue No.:PA BP832RB

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA BP843RB

allopurinol impurity C (843RB)

allopurinol impurity C (843RB)

  • Catalogue No.:PA BP843RB

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA BP845RB

allopurinol impurity E (845RB)

allopurinol impurity E (845RB)

  • Catalogue No.:PA BP845RB

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA ICRS0204

Allopurinol (ICRS0204)

Allopurinol (ICRS0204)

  • Catalogue No.:PA ICRS0204

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA USP1013035

Allopurinol Related Compound C (5-(4H-1,2,4-triazol-4-yl)-1H-pyrazole-4-carboxamide) (1013035)

Allopurinol Related Compound C (5-(4H-1,2,4-triazol-4-yl)-1H-pyrazole-4-carboxamide) (1013035)

  • Catalogue No.:PA USP1013035

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA BP844RB

allopurinol impurity D (844RB)

allopurinol impurity D (844RB)

  • Catalogue No.:PA BP844RB

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA EPA0350000

Allopurinol (A0350000)

Allopurinol (A0350000)

  • Catalogue No.:PA EPA0350000

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA EPA0350010

Allopurinol impurity A (A0350010)

Allopurinol impurity A (A0350010)

  • Catalogue No.:PA EPA0350010

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA EPA0350020

Allopurinol impurity B (A0350020)

Allopurinol impurity B (A0350020)

  • Catalogue No.:PA EPA0350020

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA EPA0350030

Allopurinol impurity C (A0350030)

Allopurinol impurity C (A0350030)

  • Catalogue No.:PA EPA0350030

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA EPA0350040

Allopurinol impurity D (A0350040)

Allopurinol impurity D (A0350040)

  • Catalogue No.:PA EPA0350040

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA EPA0350050

Allopurinol impurity E (A0350050)

Allopurinol impurity E (A0350050)

  • Catalogue No.:PA EPA0350050

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA 01 39530

Allopurinol riboside

Allopurinol riboside

  • Catalogue No.:PA 01 39530

  • CAS :

    16220-07-8

  • Molecular Formula : C10H12N4O5

  • Molecular Weight : 268.23

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Drug Reference Standards & Impurity Synthesis in India
PA IPIPRS 46 14

Allopurinol (IPRS/46/14)-from IPC

Allopurinol (IPRS/46/14)-from IPC

  • Catalogue No.:PA IPIPRS 46 14

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA 27 12262

Allopurinol - Impurity F (Dihydrochloride Salt)

Hydrazine Dihydrochloride

  • Catalogue No.:PA 27 12262

  • CAS :

    5341-61-7

  • Molecular Formula : Cl2H6N2

  • Molecular Weight : 104.96

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Drug Reference Standards & Impurity Synthesis in India
PA 01 39011

Allopurinol - Impurity A (Freebase)

5-Amino-1H-pyrazole-4-carboxamide

  • Catalogue No.:PA 01 39011

  • CAS :

    5334-31-6

  • Molecular Formula : C4H6N4O

  • Molecular Weight : 126.12

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Drug Reference Standards & Impurity Synthesis in India
PA 01 0391000

Oxypurinol

Oxypurinol

  • Catalogue No.:PA 01 0391000

  • CAS :

    2465-59-0

  • Molecular Formula : C5H4N4O2

  • Molecular Weight : 152.11

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Drug Reference Standards & Impurity Synthesis in India
PA 01 0390061

Allopurinol - Impurity F (Hydrate)

Hydrazine Monohydrate

  • Catalogue No.:PA 01 0390061

  • CAS :

    10217-52-4

  • Molecular Formula : N2H4.xH20

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA 01 0391001

(E/Z)-3-[(2-Cyano-3-ethoxy-3-oxo-1-propenyl)amino]-1H-Pyrazole-4-carboxylic Acid Ethyl Ester

(E/Z)-3-[(2-Cyano-3-ethoxy-3-oxo-1-propenyl)amino]-1H-Pyrazole-4-carboxylic Acid Ethyl Ester

  • Catalogue No.:PA 01 0391001

  • CAS :

    321571-07-7

  • Molecular Formula : C12H14N4O4

  • Molecular Weight : 278.26

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Drug Reference Standards & Impurity Synthesis in India
PA IMP 03 17

Allopurinol Impurity A (IMP/03/17)

Allopurinol Impurity A (IMP/03/17)

  • Catalogue No.:PA IMP 03 17

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA 01 0391002

N-Nitroso Allopurinol

N-Nitroso Allopurinol

  • Catalogue No.:PA 01 0391002

  • CAS :

    NA

  • Molecular Formula : C5H3N5O2

  • Molecular Weight : 165.11

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Drug Reference Standards & Impurity Synthesis in India
PA 01 0391003

9-Nitroso-9H-purin-6-ol

9-Nitroso-9H-purin-6-ol

  • Catalogue No.:PA 01 0391003

  • CAS :

    NA

  • Molecular Formula : C5H3N5O2

  • Molecular Weight : 165.11

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Drug Reference Standards & Impurity Synthesis in India
PA IPRSA033

Allopurinol (IPRSA033)

Allopurinol (IPRSA033)

  • Catalogue No.:PA IPRSA033

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA IMPF019

Allopurinol Impurity B (IMPF019)

Allopurinol Impurity B (IMPF019)

  • Catalogue No.:PA IMPF019

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA IMPA014

Allopurinol Impurity C (IMPA014)

Allopurinol Impurity C (IMPA014)

  • Catalogue No.:PA IMPA014

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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Drug Reference Standards & Impurity Synthesis in India
PA 01 0391004

3-Amino-1H-pyrazole-4-carbohydrazide

3-Amino-1H-pyrazole-4-carbohydrazide

  • Catalogue No.:PA 01 0391004

  • CAS :

    41621-10-7

  • Molecular Formula : C4H7N5O

  • Molecular Weight : 141.13

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Drug Reference Standards & Impurity Synthesis in India
PA 01 0391005

Allopurinol-Hypoxanthine Mixture

Allopurinol-Hypoxanthine Mixture

  • Catalogue No.:PA 01 0391005

  • CAS :

    69191-17-9

  • Molecular Formula : C10H8N8O2

  • Molecular Weight : 272.23

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Drug Reference Standards & Impurity Synthesis in India
PA 01 0391006

5-Amino-1-nitroso-1H-pyrazole-4-carboxamide

5-Amino-1-nitroso-1H-pyrazole-4-carboxamide

  • Catalogue No.:PA 01 0391006

  • CAS :

    NA

  • Molecular Formula : C4H5N5O2

  • Molecular Weight : 155.12

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Drug Reference Standards & Impurity Synthesis in India
PA 01 0391007

5-Formamido-1-nitroso-1H-pyrazole-4-carboxamide

5-Formamido-1-nitroso-1H-pyrazole-4-carboxamide

  • Catalogue No.:PA 01 0391007

  • CAS :

    NA

  • Molecular Formula : C5H5N5O3

  • Molecular Weight : 183.13

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Drug Reference Standards & Impurity Synthesis in India
PA 01 0391008

Ethyl 5-amino-1-nitroso-1H-pyrazole-4-carboxylate

Ethyl 5-amino-1-nitroso-1H-pyrazole-4-carboxylate

  • Catalogue No.:PA 01 0391008

  • CAS :

    NA

  • Molecular Formula : C6H8N4O3

  • Molecular Weight : 184.16

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Drug Reference Standards & Impurity Synthesis in India
PA 01 0391009

Ethyl 5-formamido-1-nitroso-1H-pyrazole-4-carboxylate

Ethyl 5-formamido-1-nitroso-1H-pyrazole-4-carboxylate

  • Catalogue No.:PA 01 0391009

  • CAS :

    NA

  • Molecular Formula : C7H8N4O4

  • Molecular Weight : 212.17

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Drug Reference Standards & Impurity Synthesis in India
PA BSC 0390101130

Hydrazine Hydrate (BSC)

Hydrazine Hydrate (BSC)

  • Catalogue No.:PA BSC 0390101130

  • CAS :

    10217-52-4

  • Molecular Formula : H4N2 . x(H2O)

  • Molecular Weight : 32.05 . x(18.02)

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